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+%% 
+%%  An UIT Edition example
+%% 
+%%  Example 09-15-1 on page 180.
+%% 
+%%  Copyright (C) 2010 Herbert Voss
+%% 
+%%  It may be distributed and/or modified under the conditions
+%%  of the LaTeX Project Public License, either version 1.3
+%%  of this license or (at your option) any later version.
+%% 
+%%  See http://www.latex-project.org/lppl.txt for details.
+%% 
+%% 
+%% ==== 
+% Show page(s) 1
+%% 
+\documentclass[]{exaarticle}
+\pagestyle{empty}
+\setlength\textwidth{375.57637pt}
+\AtBeginDocument{\setlength\parindent{0pt}}
+\StartShownPreambleCommands
+\newcommand*\diff{\mathop{}\!\mathrm{d}}
+\StopShownPreambleCommands
+\begin{document}
+\[\int_{-1}^{+1}\frac{f(x)}{\sqrt{1-x^{2}}}\diff x\approx\frac{\pi}{n}\sum_{i=1}^{n}f
+  \left(\cos\left(\frac{2i-1}{2n}\right)\right) \]
+\end{document}